Union Bridge enters the testnet on Rootstock, introducing a 1-of-n honest model to replace trusted intermediaries.
A Bitcoin bridge architecture, dubbed Union Bridge, has officially entered its testnet phase on Rootstock.
Designed by Rootstock co-founder Sergio Damian Lerner alongside teams from RootstockLabs and Fairgate Labs, the system aims to redefine how assets are transferred between networks.
Bitcoin bridges in production usually rely on trusted parties which require an honest majority to function safely, and Union Bridge addresses this vulnerability by replacing intermediaries with cryptographic dispute resolution settled directly on the Bitcoin network.
Operating under a 1-of-n honest assumption, the platform shifts the security paradigm from collective trust to individual oversight. The infrastructure is built on BitVMX, an optimistic verification framework where bridge operations are assumed correct unless challenged.
The system utilises two primary roles: functionaries, who operate the bridge and post security bonds, and watchtowers. Unlike similar BitVM-based projects that retain strict governance over operator membership, Union is designed to push further toward permissionless verification through the watchtower role.
While the initial implementation connects Rootstock to the Bitcoin network, the packet-based architecture can be adapted to any blockchain equipped with a Bitcoin light client.
The project is currently undergoing public security reviews and audits to prepare for future deployment.
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